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<p class="line867"><strong>Which UTM variables should I use for A/B Testing?</strong> <p class="line874">A/B tests are useful for testing different versions of emails and ads. Use utm_source, utm_medium, utm_content, and utm_campaign to differentiate links from different ads and emails and to differentiate the multiple links within each ad and email. <p class="line874">The following example illustrates the use of UTM variables in an email newsletter. In this example, the newsletter contains multiple links to a single page on your web site. Note that the utm_content is the only value that differs between the two links. <p class="line874">The first link is a text link: <pre>    http://www.example.com/buy_page?utm_source=newsletter&amp;utm_medium=email&amp;utm_content=buytext&amp;utm_campaign=brand_x
</pre><p class="line874">The second link is a hyperlinked image: <pre>    http://www.example.com/buy_page?utm_source=newsletter&amp;utm_medium=email&amp;utm_content=buypict&amp;utm_campaign=brand_x
</pre><p class="line862">Use the Google Analytics <a class="http" href="http://www.google.com/support/analytics/bin/answer.py?hl=en&amp;answer=55578">URL builder tool</a> to create your links. Using this tool ensures that your links contain the correct syntax. <p class="line867"><span class="u">Important</span>: Use consistent names and spellings for all of your campaign variable values.  </div><div id="pagebottom"></div>
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